Stoptech 128.33123L Disc Brake Rotor - Front Left

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.33123L) are engineered for Audi vehicles including the A4, A4 Quattro, A5, A5 Quattro, and Q5 models. Designed to provide consistent braking performance, these rotors feature a vented and cross-drilled surface to enhance heat dissipation and reduce brake fade under demanding conditions.

• Cross-drilled surface for improved heat dissipation
• Vented rotor design with pillar-style vanes
• Coated hat finish to resist corrosion
• Floating disc mounting for better thermal expansion
• Compatible with Audi A4, A4 Quattro, A5, A5 Quattro, and Q5
• Part Number: 128.33123L

Technical Specifications and Features

The StopTech Sport Cross-Drilled Disc Brake Rotors measure 320 mm (12.598 inches) in outside diameter with an overall height of 52.2 mm (2.055 inches). The nominal thickness is 29.8 mm (1.173 inches), with a discard thickness of 28 mm (1.102 inches), ensuring a long service life before replacement is necessary. These rotors feature a vented design with pillar-style vanes that promote efficient airflow to maintain optimal operating temperatures. The floating disc mounting system accommodates thermal expansion, reducing the risk of warping during heavy braking. The hat section is coated to protect against corrosion, extending rotor durability. The rotor includes five stud/lug holes with a 112 mm (4.409 inches) bolt circle diameter and a center hole diameter of 68 mm (2.677 inches). This rotor does not include ABS tone rings or bearings.

StopTech Sport Cross-Drilled Disc Brake Rotors Product Line

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed for drivers seeking enhanced braking performance with reliable heat management. The cross-drilled surface pattern improves water and gas evacuation from the rotor surface, which helps maintain consistent brake pad contact and reduces fade. This product line focuses on vented rotors with pillar vanes to optimize cooling efficiency, making it suitable for both street and light track use. The coated hat finish adds corrosion resistance, which is beneficial for vehicles exposed to varying weather conditions.

Applications and Problem Solving

• Reduces brake fade during aggressive driving or towing
• Improves heat dissipation to prevent rotor warping
• Minimizes brake dust and gas buildup on rotor surface
• Enhances braking consistency in wet conditions
• Extends rotor lifespan with corrosion-resistant coating

Installation Notes and Tips

When installing the StopTech Sport Cross-Drilled Disc Brake Rotors (128.33123L) on compatible Audi models, ensure the rotor surface is clean and free of any protective coatings before mounting. Verify the rotor thickness is above the discard limit of 28 mm to maintain safety and performance. Use proper torque specifications for the five lug holes with a 112 mm bolt circle diameter. Since these rotors do not include bearings or ABS tone rings, reuse existing components if applicable. It is recommended to replace brake pads simultaneously to ensure optimal braking performance.

Quality Assurance and Warranty

StopTech manufactures these rotors to meet or exceed OEM specifications for fit, form, and function. The coated hat finish and vented design contribute to durability and consistent performance. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Always consult the product documentation or manufacturer for exact warranty terms.